I think you should make the ramp longer and flatter.
If is is made of asphalt, I'm not sure how to DIY. But in my community, when they only close the potholes with a spade full of asphalt, they drive around with a small van that has a flat back, where some hot samping asphalt is laying on. The man who does the work, spades off some asphalt at each hole. This lasts for quite some time. Maybe there is on option for you to order some asphalt that is delivered hot and semi-fluid, so that you can make a new, flatter ramp quickly.